In the late 1930s, manufacturers began using Polyvinyl Butyral (PVB) to make auto glass clearer and stronger as well as to help block sound and harmful ultraviolet rays. By 1937, safety glass became mandated for all cars.
Do all car windows have safety glass?
Here’s something you may not know: Every window in your car doesn’t necessarily have tempered glass, the kind that turns into a pile of small harmless chunks in case of breakage. Instead, some of your windows, nearly always at the side and occasionally at the rear, may be made of laminated glass.
When was shatterproof glass for cars invented?
The Accidental Discovery of Shatterproof Glass
Automotive safety glass can trace its history back to 1903, when a French chemist named Edouard Benedictus was working with glass flasks in his laboratory. Benedictus had placed a transparent coating into one of the flasks that he was using for his experiment.
Is safety glass required on cars?
All vehicles sold in the United States are required to use safety glass in the front windshield. However, very few vehi¬cles on the road today use safety glass in any window other than the front windshield. … Laminated safety glass was first offered as standard equipment on the 1936 Rickenbacker.
Why did old cars have split windshields?
In the 1930s, Cadillacs offered cars with a V-split windshield that allowed half of the windshield to swing out. Chevrolet countered with a tiltable windshield. … By reducing framing, these windshields also allowed for more spacious car interiors. As a result, automobile designs became less boxy.
Why do car side windows shatter?
Extreme heat causes expansion. A crack or nick in your auto glass can grow as the glass expands under the heat. … After too much of this, the glass can completely shatter if it receives any type of shock or hard shake. Whether heat or cold, the process of thermal stress is a common cause of auto glass damage.
Do all new cars have laminated glass?
Today, almost all vehicles have laminated glass windshields and tempered glass side windows. Tempered glass is a single sheet of hard glass that has been cooled rapidly, causing it to have strong internal stresses.
How was safety glass accidentally discovered?
Safety glass was discovered accidentally by Edouard Benedictus, a French scientist in 1903 when he dropped a glass flask while he was working in his laboratory. This flask had contained cellulose nitrate, a liquid plastic, which enabled it to keep more or less its original shape when it had been dropped.
When were laminated windscreens introduced?
Henry Ford was the first car manufacturer to use laminated glass, adding it onto all his vehicles between 1919-1929. Many other car manufacturers followed Ford by swapping to laminated glass, as it clearly became the safest and most suitable glass material for a windscreen.
Who invented toughened glass?
Francois Barthelemy Alfred Royer de la Bastie (1830–1901) of Paris, France is credited with first developing a method of tempering glass by quenching almost molten glass in a heated bath of oil or grease in 1874, the method patented in England on August 12, 1874, patent number 2783.
When did safety glass become standard in sliding doors?
There is no specific date that we can use to determine whether safety glass was installed, since codes vary by location and are modified over time. Generally though, we should be able to expect that most patio doors and shower doors used tempered glass by the early 1970’s.
Is it illegal to drive without a back window in California?
California does have regulations governing chips and cracks in both the windshield and the rear window. Drivers are not permitted to drive on California roads with a windshield or rear window that has defects that impair the driver’s vision.
When were side airbags invented?
As we know this led to all sorts of airbag placements, including by the knee, over the window as a curtain, a seat cushion airbag, and now even seat belts have them. In frontal crashes, front airbags reduce driver fatalities by 29 percent and fatalities of front-seat passengers age 13 and older by 32 percent.
What was the first car to have a windshield?
The earliest windshield models were simply two horizontal sheets of window-pane glass that could be folded down if they became dirty. Oldsmobile was the first company to introduce them as a standard feature in 1915.
Who invented windshield glass?
Most of the inventions in history were made by accidents. The present car windshields were also invented by accident. Edouard Benedictus made an accidental discovery in his lab.
When did split windshields stop?
Seems that most cars had abandoned the split windshield by about 1955.